g-C_3N_4/C@Bi_2MoO_6复合光催化剂的制备及其光催化活性
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摘要
通过水热合成法和液相沉积法制备g-C_3N_4/C@Bi_2MoO_6复合光催化剂,并采用X射线衍射、扫描电子显微镜、氮气吸脱附、紫外-可见漫反射等技术对其进行表征。研究了可见光下g-C_3N_4/C@Bi_2MoO_6催化降解罗丹明B(Rh B)的影响因素,并对其光催化反应机理进行初步探讨。实验结果表明:g-C_3N_4掺杂量为60%(w)时g-C_3N_4/C@Bi_2MoO_6的光催化活性最高;在60%g-C_3N_4/C@Bi_2MoO_6的投加量为1.00 g/L、初始Rh B质量浓度为2.50 mg/L、可见光照射150 min的条件下,Rh B的降解率达到97.90%;在g-C_3N_4/C@Bi_2MoO_6光催化降解体系中,h~+和·O_2~-是主要活性物种。
The composite photocatalyst g-C_3N_4/C@Bi_2MoO_6 was prepared by hydrothermal synthesis method and liquid deposition method,and characterized by XRD,SEM,BET and UV-Vis DRS. The factors affecting rhodamine B(Rh B)degradation by g-C_3N_4/C@Bi_2MoO_6 under visible light were studied,and the mechanism of photocatalytic reaction was discussed. The experimental results showed that:When the doping content of g-C_3N_4 was 60%(w),the photocatalytic activity of g-C_3N_4/C@Bi_2MoO_6 was the highest;Under the conditions of 60%g-C_3N_4/C@Bi_2MoO_6 amount 1.00 g/L,initial Rh B mass concentration 2.50 mg/L and visible light irradiation time 150 min,the degradation rate of Rh B was 97.90%;The photogenerated hole h~+ and superoxide anion radical ·O_2~-were the major active species in the g-C_3N_4/C@Bi_2MoO_6 photocatalytic degradation system.
The composite photocatalyst g-C_3N_4/C@Bi_2MoO_6 was prepared by hydrothermal synthesis method and liquid deposition method,and characterized by XRD,SEM,BET and UV-Vis DRS. The factors affecting rhodamine B(Rh B)degradation by g-C_3N_4/C@Bi_2MoO_6 under visible light were studied,and the mechanism of photocatalytic reaction was discussed. The experimental results showed that:When the doping content of g-C_3N_4 was 60%(w),the photocatalytic activity of g-C_3N_4/C@Bi_2MoO_6 was the highest;Under the conditions of 60%g-C_3N_4/C@Bi_2MoO_6 amount 1.00 g/L,initial Rh B mass concentration 2.50 mg/L and visible light irradiation time 150 min,the degradation rate of Rh B was 97.90%;The photogenerated hole h~+ and superoxide anion radical ·O_2~-were the major active species in the g-C_3N_4/C@Bi_2MoO_6 photocatalytic degradation system.
引文
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[2]张月,赵雪姣,段元首,等.Ag2O-Bi2Mo O6:制备及光催化降解富里酸[J].无机化学学报,2015,31(5):939-946.
[3]DING X,HO W,SHANG J,et al.Self doping promoted photocatalytic removal of no under visible light with Bi2Mo O6:indispensable role of superoxide ions[J].Appl Catal B:Environ,2016,182:316-325.
[4]PHURUANGRAT A,DUMRONGROJTHANATH P,THONGTEM S,et al.Synthesis and characterization of visible light-driven W-doped Bi2Mo O6,photocatalyst and its photocatalytic activities[J].Mater Lett,2017,194:114-117.
[5]张俊磊,张丽莎,鞠小逖,等.Bi2Mo O6-Pt异质结的制备及其光催化性能研究[J].环境科学学报,2016,36(6):2050-2058.
[6]LI H,HOU W,TAO X,et al.Conjugated polyenemodified Bi2MO6(M=Mo or W)for enhancing visible light photocatalytic activity[J].Appl Catal B:Environ,2015,172:27-36.
[7]ZHAO G,HUANG X,FINA F,et al.Facile structure design based on C3N4 for mediator-free Z-scheme water splitting under visible light[J].Catal Sci Technol,2015,5(6):3416-3422.
[8]HONG Y,JIANG Y,LI C,et al.In-situ synthesis of direct solid-state Z-scheme V2O5/g-C3N4 heterojunctions with enhanced visible light efficiency in photocatalytic degradation of pollutants[J].Appl Catal B:Environ,2016,180:663-673.
[9]HE Y,ZHANG L,FAN M,et al.Z-scheme Sn O2-x/g-C3N4 composite as an efficient photocatalyst for dye degradation and photocatalytic CO2 reduction[J].Sol Energy Mater Sol Cells,2015,137:175-184.
[10]褚亮亮,王储备,周建伟,等.PW12/g-C3N4光催化降解甲基橙[J].化工环保,2015,35(4):438-442.
[11]李新玉,芳艳芬,熊世威,等.钼酸铋光催化剂的制备及其光催化活性[J].环境化学,2013,32(9):1611-1618.
[12]CHEN S,HU Y,JIANG X,et al.Fabrication and characterization of novel Z-scheme photocatalyst WO3/g-C3N4,with high efficient visible light photocatalytic activity[J].Mater Chem Phys,2015,149/150:512-521.
[13]ZHANG F J,ZHU S F,XIE F Z,et al.Plate-onplate structured Bi2Mo O6/Bi2WO6 heterojunction with high-efficiently gradient charge transfer for decolorization of MB[J].Sep Purif Technol,2013,113(29):1-8.
[14]MENG X,ZHANG Z.Bi2Mo O6 co-modified by reduced graphene oxide and palladium(Pd2+and Pd0)with enhanced photocatalytic decomposition of phenol[J].Appl Catal B:Environ,2017,209:383-393.
[15]林雪,郭晓宇,王庆伟,等.Bi2Mo O6/Bi VO4异质结的水热合成和可见光催化活性[J].物理化学学报,2014,30(11):2113-2120.
[16]左广玲,叶红勇,李入林.WO3/γ-Bi2Mo O6异质结的制备及其光催化性能[J].化工环保,2015,35(3):312-317.
[17]JONJANA S,PHURUANGRAT A,THONGTEM T,et al.Synthesis,analysis and photocatalysis of Ag Br/Bi2Mo O6 nanocomposites[J].Mater Lett,2016,172:11-14.
[18]李丽华,马明明,任庆军,等.Ce O2/三维石墨烯催化臭氧氧化降解刚果红[J].化工环保,2017,37(3):294-299.
[19]左广玲,叶红勇,李入林.超声辅助沉淀法制备γ-Bi2Mo O6及其光催化性能[J].化工环保,2015,35(1):89-93.
[20]Yuan B,Wei J,Hu T,et al.Simple synthesis of g-C3N4/r GO hybrid catalyst for the photocatalytic degradation of rhodamine B[J].Chin J Catal,2015,36(7):1009-1016.
[21]ZHANG Z,ZHENG T,XU J,et al.Carbon quantum dots/Bi2Mo O6 composites with photocatalytic H2evolution and near infrared activity[J].J Photochem Photobiol A Chem,2017,346:34-31.
[22]SHI F,CHEN L,CHEN M,et al.A g-C3N4/nanocarbon/Zn In2S4 nanocomposite:an artificial Z-scheme visible-light photocatalytic system using nanocarbon as the electron mediator[J].Chem Commun,2015,51(96):17144-17147.